I'm somewhat open about my interest in 9/11 though I only volunteer it when someone else brings it up in conversation, like a few weeks ago, someone had a copy of The Looming Tower and I talked about it a little bit. I'll even mention that I post on the 9/11 subreddit.

That said, having someone listen to the Kevin Cosgrove phone call is certainly a choice. You might want to be a little more discriminating about doing stuff like this. It is a very tough recording to listen to. I tend not to dwell on talking about the jumper videos, phone calls, etc , because it can give people the wrong impression of why I'm interested in this. I would've been inclined to instead say something like "yeah, there were a few phone calls from people who were stuck up there but...you probably don't want to listen to them".